1664949566336 has 128 divisors (see below), whose sum is σ = 4098091699200. Its totient is φ = 657724188672.

The previous prime is 1664949566281. The next prime is 1664949566359. The reversal of 1664949566336 is 6336659494661.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691736 + ... + 1951511.

It is an arithmetic number, because the mean of its divisors is an integer number (32016341400).

Almost surely, 2^{1664949566336} is an apocalyptic number.

1664949566336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1664949566336 is an abundant number, since it is smaller than the sum of its proper divisors (2433142132864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664949566336 is a wasteful number, since it uses less digits than its factorization.

1664949566336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643324 (or 2643312 counting only the distinct ones).

The product of its digits is 453496320, while the sum is 68.

The spelling of 1664949566336 in words is "one trillion, six hundred sixty-four billion, nine hundred forty-nine million, five hundred sixty-six thousand, three hundred thirty-six".